判断一段内存是否全部为0

89 阅读 0 评论 59 点赞

我是靠谱客的博主靓丽背包，这篇文章主要介绍判断一段内存是否全部为0，现在分享给大家，希望可以做个参考。

方法一：

        start = clock();
	while( (BITSIZE-sizeof(int)*index)>=sizeof(int) )
	{
		//printf("%d %dt",( *(int *)((char*)bits+sizeof(int)*index) ),(*(bits+index)));
		//result |= ( *(int *)((char*)bits+sizeof(int)*index) );
		result |= ( *(bits+index) );
		index++;
	}
	if(result==0)
		printf("bits is all 0!n");
	else
		printf("bits is not all 0!n");
	finish = clock();
	printf( "%d %d %d tickn",start,finish, finish - start );

方法二：

        start = clock();
	while(  (BITSIZE-sizeof(int)*index)>=sizeof(int)  )
	{
		if( *(bits+index)==0 )
		{
			index++;
			continue;
		}
		else
			break;
	}
	if(index==(BITSIZE/sizeof(int)))
		printf("bits is all 0!n");
	else
		printf("bits is not all 0!n");
	finish = clock();
        printf( "%d %d %d tickn",start,finish, finish - start );

方法一和方法二的效率基本一致